设数列
是公差为
的等差数列,若
,则![](https://img.xkw.com/dksih/QBM/2015/5/11/1572101959180288/1572101964881920/STEM/acb6deea4123472aaffe9e49acf9469b.png?resizew=28)
________ ;![](https://img.xkw.com/dksih/QBM/2015/5/11/1572101959180288/1572101964881920/STEM/bf065b45f2e141ebb4c7a4e13d0eefb3.png?resizew=36)
_________
![](https://img.xkw.com/dksih/QBM/2015/5/11/1572101959180288/1572101964881920/STEM/610ec84e192b4b46acd65bf0c87ce861.png?resizew=32)
![](https://img.xkw.com/dksih/QBM/2015/5/11/1572101959180288/1572101964881920/STEM/e5b59dbe62d4459986299a3d5b46ffd7.png?resizew=15)
![](https://img.xkw.com/dksih/QBM/2015/5/11/1572101959180288/1572101964881920/STEM/41bf83af50574610a71c0e753816b51d.png?resizew=84)
![](https://img.xkw.com/dksih/QBM/2015/5/11/1572101959180288/1572101964881920/STEM/acb6deea4123472aaffe9e49acf9469b.png?resizew=28)
![](https://img.xkw.com/dksih/QBM/2015/5/11/1572101959180288/1572101964881920/STEM/bf065b45f2e141ebb4c7a4e13d0eefb3.png?resizew=36)
更新时间:2016-12-03 13:12:32
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【知识点】 等差数列通项公式的基本量计算
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